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Many circuit breakers are tested by use of secondary injection test equipment applied to the breaker’s trip unit. These specialty test sets check the trip function of the circuit breaker — in other words, whether the electronics in the breaker are functioning properly. When you have work requirements that involve testing and maintaining Merlin Gerin circuit breakers, the Merlin Gerin Secondary Injection Test Set is ideal for verifying the proper operation of the trip circuitry. Merlin Gerin is only one of several well-known brands in the Protec stable of test equipment rental.

For checking circuit breaker and protective relay systems, the secondary injection test set is an essential piece of electrical test equipment for companies to use. It differs from the standard primary injection testing method in that it does not require high current to be passed through the primary current path, but rather tests the breaker as a result of low level signals sent directly to the solid state trip device that controls the operation of the breaker.

A contact resistance test (also known as a ductor test) measures the resistance of electrical connections such as joints, terminations and connectors. These can be connections between any two conductors, for instance busbar sections or cable connections. The test measures the resistance at the micro- or milli-ohm level and is used primarily to verify that electrical connections are made properly, and can detect the following problems:

With the critical role that protective relays play in arresting and isolating electrical faults, it is extremely important to know that they are operating in concert with their design and intent. The unplanned downtime and damages associated with the mis-operation of protective devices during fault conditions can be incredibly detrimental. Regular maintenance testing allows the discovery and resolution of such issues before they are able to escalate into very costly problems.

The Fault Wizard from Innovative Utility Products is a versatile and portable fault locator that uses arc reflection technology. It helps to localize faults in direct buried cables and display the distance to the faulted portion of the cabling. It also has other features that help make troubleshooting underground cable fast and easy.

Finding the right diagnostic test to maintain and protect electrical equipment means using the best manufacturer’s equipment to get the right product for the job. When it comes to the power factor test, two makers stand out with reliable and accurate equipment that users can count on to perform optimally every time.

When transformers experience physical impacts or sudden changes in the electrical system that cause movement of the physical components, it is helpful to know if these events have had permanent impacts on the internal geometry of the transformer. This can be particularly difficult in liquid filled transformers without going through the time and very costly expense of de-tanking the transformer. However, the application of Sweep Frequency Response Analysis, allows for a highly sensitive measurement to physical changes of the internal workings of the transformer without having to without having to visually inspect the inner workings of the transformer.

The Cooper VFI Vacuum Fault Interrupter Testeris a current injection device designed to simulate Fault Current for verification of minimum trip values and time current characteristics of Tri-Phase and TPG electronic control boards utilized in VFI pad-mounted switchgear.

Three internal flux-shift trippers enable confirmation of the presence of sufficient levels of energy upon the control board for operation of pad-mounted VFI flux-shift trippers. The on-board flux-shift trippers also enable self-checking of the VFI tester prior to general control testing. Further flux-shift tripper capability enables verification of operation of the flux-shift trippers within the VFI unit under test, external to the Cooper VFI tester.

The HV Diagnostics EZ-Cable ID Test Instrumentallows electrical testing personnel to accurately and effectively identify either one or three cables or cores anywhere along the length of the cable in one identification process. This can be done on both single phase and three phase networks. In addition to identifying the correct cable and phase, the resultant current and frequency in a cable can also be measured by the instrument.

The test set consists of 3 main items: A receive (Rx), transmitter (Tx), and inductive clamp/s, all housed in a rugged, injection molded carrying case. The instrument is extremely easy to use and can be powered by either the internal battery, AC mains or from an auxiliary 12V DC supply. The receiver has a backlit LCD display, is battery operated, housed in a rugged, rubber holster and has a flexible pickup coil to easily wrap around cables.